It is common PCB color from Gigabyte for everything 3dfx and Nvidia related. Gigabyte was already huge manufacturer back then, so this model is nothing special and can't be compared to Raven.
I know blue was a common color for Gigabyte in the early 2000s, but they were still making yellow colored boards for most models until the Tualatin\Athlon XP era. More importantly, how many Gigabyte Banshees do you see around these days? I've personally owned several very uncommon 3dfx cards (like the PCI Ravens, 2x Canopus Pure3D with VGA cable, boxed Diamond Monster II, 10MB Q3D V2, Hercules Voodoo Rush, Orchid Righteous 3D), I own a working Quantum3D Graphite, I've had a few Banshees (mostly Ensoniq, Diamond and Quantum3D), and yet I've never even had the opportunity to pick up a cheap Gigabyte Banshee, and it is one of only a few blue 3dfx cards ever made. To me, that makes it uncommon. That's all I was saying.
Maybe outside of the US there are Gigabyte Banshees (possibly the best Banshee cards around) available frequently for low prices, but that's certainly not the case here.
My only reason for mentioning this is that its a card worth fixing.
Time Machine = FIC PA-2013 2.1 - K6-2 500 - 256MB PC-100 - TNT2 Pro 16MB AGP - Labway Yamaha YMF719-E - Midiman MM401